tarfs: use GPF_NOFS when allocating memory on a mounted fs

When a mounted filesystem needs memory that isn't available, this flag
instructs the kernel allocator to not request (and wait for) file
systems to shrink caches because it may lead to deadlocks.

Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>

src/tarfs/tarfs.c

@@ -131,7 +131,7 @@ static int tarfs_readdir(struct file *file, struct dir_context *ctx)
 				break;
 			}
 
-			name_buffer = kmalloc(disk_len, GFP_KERNEL);
+			name_buffer = kmalloc(disk_len, GFP_NOFS);
 			if (!name_buffer) {
 				ret = -ENOMEM;
 				break;
@@ -457,7 +457,7 @@ static struct inode *tarfs_alloc_inode(struct super_block *sb)
 {
 	struct tarfs_inode_info *info;
 
-        info = alloc_inode_sb(sb, tarfs_inode_cachep, GFP_KERNEL);
+        info = alloc_inode_sb(sb, tarfs_inode_cachep, GFP_NOFS);
         if (!info)
                 return NULL;